[Mep-dev] Dayton Presentation Snapshot 1

[Grant Hodgson]

Michelle

Good work.

I'd like to make the following points :-

1) Page 18 (uWSDR) - instead of :- 

'If we’re not going to be using transverters, then what
are we going to be using? SDRs'

Might be better to say something like :-

'....going to be using?  New SDRs using direct conversion from microwaves to 
baseband' 

or something similar along those lines.   Bit picky maybe, but a lot of 
microwavers at the moment use both transverters and (HF) SDRs together, to
good effect.  Which leads on to another point :-

2) I'm not sure that I entirely agree with Steve N2CEI's comments, although he
makes a good point.   However, the use of modern components can result in a
considerable improvement in receiver performance.  

Detailed system simulations show that the receiver architecture planned for 
the uWSDR receivers should give levels IMD rejection that are far 
greater than those from any currently available amateur microwave transverter
+ IF rig combination.
  
(I might add that the 2.3GHz uWSDR receiver design has got as far as schematic
capture, which is now done.  As soon as the GeMMA Tx is sorted work can start
on the rest of the layout for the full transceiver.  Just don't ask me when it
will be ready!)

3) The uWSDR project is aimed (at least initially) at producing equipment for
narrowband use.  However, the key components (PLL, Tx modulator, Rx
demodulator) are suitable for very wide IF bandwidths indeed (hundreds of
MHz), and therefore the RF hardware should require just a minimal amount of
changes in order to be able to carry the bandwidths required for MEP.  I don't
see these changes as a major problem.

4)Flattering though it is, I'm not sure that I could rightly be called the
'co-ordinator' - I think it is my lack of progress with the microwave hardware
that is slowly the project down at the moment...

5)I gave a 45-minute presentation about GeMMA (uWSDR project transmitter) at
the RAL Roundtable just a couple of weeks ago; as with most UK amateur
microwave events nowadays it was videoed by the British Amateur TV club, and
should appear on the www.BATC.tv website shortly.  I'll upload the Powerpoint
slides to the web as soon as I get the chance.  Most of the slides from the
MUD 2007 presentation are still valid; these can be obtained from the uWSDR
web site  uwsdr.net

Hope that helps.

regards

Grant  G8UBN


On Wed, 06 May 2009 13:49:28 -0700, mep-dev-request wrote
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>    1. Dayton Presentation Snapshot 1 (Michelle)
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 6 May 2009 13:45:34 -0700 (PDT)
> From: Michelle <w5nyv at yahoo.com>
> Subject: [Mep-dev] Dayton Presentation Snapshot 1
> To: mep <mep-dev at uppermeadow.com>
> Message-ID: <64836.84616.qm at web51601.mail.re2.yahoo.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> Here is the presentation for Dayton so far. I expect to cut another 
> PDF very soon.
> 
> This is a combination of lecture notes and slides. Not everything 
> seen in the PDF will be on the screen. However, this shows what is 
> captured so far, and is intended to outline the subject of the talk.
> 
> Feedback encouraged and appreciated.
> -Michelle W5NYV
> 
> Potestatem obscuri lateris nescis.
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